Remove assertions preventing calldata->calldata conversion when cleanup is needed

Changelog.md

@@ -7,6 +7,7 @@ Compiler Features:
 
 
 Bugfixes:
+ * Code Generator: Fix internal compiler error when calling functions bound to calldata structs and arrays.
 
 
 ### 0.8.6 (2021-06-22)

libsolidity/codegen/CompilerUtils.cpp

@@ -1078,8 +1078,7 @@ void CompilerUtils::convertType(
 		}
 		case DataLocation::CallData:
 			solAssert(
-				targetType.isByteArray() &&
-				typeOnStack.isByteArray() &&
+				((targetType.isByteArray() && typeOnStack.isByteArray()) || _typeOnStack == _targetType) &&
 				typeOnStack.location() == DataLocation::CallData,
 				"Invalid conversion to calldata type."
 			);
@@ -1130,9 +1129,6 @@ void CompilerUtils::convertType(
 		solAssert(targetTypeCategory == stackTypeCategory, "");
 		auto& targetType = dynamic_cast<StructType const&>(_targetType);
 		auto& typeOnStack = dynamic_cast<StructType const&>(_typeOnStack);
-		solAssert(
-			targetType.location() != DataLocation::CallData
-		, "");
 		switch (targetType.location())
 		{
 		case DataLocation::Storage:
@@ -1208,7 +1204,8 @@ void CompilerUtils::convertType(
 			}
 			break;
 		case DataLocation::CallData:
-			solAssert(false, "Invalid type conversion target location CallData.");
+			solAssert(_typeOnStack == _targetType, "");
+			// nothing to do
 			break;
 		}
 		break;

test/libsolidity/semanticTests/calldata/calldata_bound_bytes.sol

@@ -0,0 +1,20 @@
+pragma abicoder v2;
+
+library L {
+    function reverse(bytes calldata _b) internal pure returns (bytes1, bytes1) {
+        return (_b[1], _b[0]);
+    }
+}
+
+contract C {
+    using L for bytes;
+
+    function test(uint, bytes calldata _b, uint) external pure returns (bytes1, bytes1) {
+        return _b.reverse();
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// test(uint256,bytes,uint256): 7, 0x60, 4, 2, "ab" -> "b", "a"

test/libsolidity/semanticTests/calldata/calldata_bound_dynamic_array_or_slice.sol

@@ -0,0 +1,25 @@
+pragma abicoder v2;
+
+library L {
+    function reverse(uint[] calldata _a) internal pure returns (uint, uint) {
+        return (_a[1], _a[0]);
+    }
+}
+
+contract C {
+    using L for *;
+
+    function testArray(uint, uint[] calldata _a, uint) external pure returns (uint, uint) {
+        return _a.reverse();
+    }
+
+    function testSlice(uint, uint[] calldata _a, uint) external pure returns (uint, uint) {
+        return _a[:].reverse();
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// testArray(uint256,uint256[],uint256): 7, 0x60, 4, 2, 66, 77 -> 77, 66
+// testSlice(uint256,uint256[],uint256): 7, 0x60, 4, 2, 66, 77 -> 77, 66

test/libsolidity/semanticTests/calldata/calldata_bound_static_array.sol

@@ -0,0 +1,20 @@
+pragma abicoder v2;
+
+library L {
+    function reverse(uint[2] calldata _a) internal pure returns (uint, uint) {
+        return (_a[1], _a[0]);
+    }
+}
+
+contract C {
+    using L for uint[2];
+
+    function test(uint, uint[2] calldata _a, uint) external pure returns (uint, uint) {
+        return _a.reverse();
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// test(uint256,uint256[2],uint256): 7, 66, 77, 4 -> 77, 66

test/libsolidity/semanticTests/calldata/calldata_bound_struct.sol

@@ -0,0 +1,24 @@
+pragma abicoder v2;
+
+struct S {
+    uint x;
+    uint y;
+}
+
+library L {
+    function reverse(S calldata _s) internal pure returns (uint, uint) {
+        return (_s.y, _s.x);
+    }
+}
+
+contract C {
+    using L for S;
+
+    function test(uint, S calldata _s, uint) external pure returns (uint, uint) {
+        return _s.reverse();
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// test(uint256,(uint256,uint256),uint256): 7, 66, 77, 4 -> 77, 66

test/libsolidity/semanticTests/calldata/calldata_struct.sol

@@ -0,0 +1,22 @@
+pragma abicoder v2;
+
+struct S {
+    uint x;
+    uint y;
+}
+
+library L {
+    function reverse(S calldata _s) internal pure returns (uint, uint) {
+        return (_s.y, _s.x);
+    }
+}
+
+contract C {
+    function test(uint, S calldata _s, uint) external pure returns (uint, uint) {
+        return L.reverse(_s);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// test(uint256,(uint256,uint256),uint256): 7, 66, 77, 4 -> 77, 66

test/libsolidity/syntaxTests/bound/bound_to_calldata_struct.sol

@@ -0,0 +1,15 @@
+struct S {
+    uint x;
+}
+
+library L {
+    function f(S calldata) internal pure {}
+}
+
+contract C {
+    using L for S;
+
+    function run(S calldata _s) external pure {
+        _s.f();
+    }
+}